Widgets display live information from their associated apps. A weather widget, for example, will display the current temperature and weather conditions for your location without you having to open the weather app. Common widgets include those that display breaking news, recent email messages, and upcoming appointments from your calendar. You can now add widgets, or stacks of widgets, to any Home Screen page.
Smart Stacks are a collection of widgets that change according to your location, the time of day, or an activity. You add a Smart Stack using the procedure we just went through, but you can scroll through a Smart Stack on your Home Screen to see what is available and tap any of the apps to open.